package com.noteam.chinamapview;

import ohos.agp.components.*;
import ohos.agp.utils.DimensFloat;
import ohos.agp.utils.Matrix;
import ohos.agp.utils.Point;
import ohos.agp.utils.Rect;
import ohos.app.Context;
import ohos.multimodalinput.event.KeyBoardEvent;
import ohos.multimodalinput.event.KeyEvent;
import ohos.multimodalinput.event.MmiPoint;
import ohos.multimodalinput.event.TouchEvent;

import java.util.ArrayList;
import java.util.List;

/**
 * 说明：横竖都可以滑动，同时可以放大缩小的ScrollView
 * Created by lmj on 2017/3/24.
 */
public class HVScaleScrollView extends StackLayout implements Component.EstimateSizeListener, Component.KeyEventListener
        , Component.TouchEventListener {
    static final int ANIMATED_SCROLL_GAP = 250;

    static final float MAX_SCROLL_FACTOR = 0.5f;


    private long mLastScroll;

    private final Rect mTempRect = new Rect();
    private ScrollHelper mScroller;

    /**
     * Position of the last motion event.
     */
    private double mLastMotionY;
    private double mLastMotionX;

    /**
     * True if the user is currently dragging this ScrollView around. This is
     * not the same as 'is being flinged', which can be checked by
     * mScroller.isFinished() (flinging begins when the user lifts his finger).
     */
    private boolean mIsBeingDragged = false;

    /**
     * Determines speed during touch scrolling
     */
    private VelocityDetector mVelocityTracker;

    /**
     * When set to true, the scroll view measure its child to make it fill the currently
     * visible area.
     */
    private boolean mFillViewport;

    /**
     * Whether arrow scrolling is animated.
     */
    private boolean mSmoothScrollingEnabled = true;

    private int mMinimumVelocity;
    private int mMaximumVelocity;

    /**
     * ID of the active pointer. This is used to retain consistency during
     * drags/flings if multiple pointers are used.
     */
    private int mActivePointerId = INVALID_POINTER;

    /**
     * Sentinel value for no current active pointer.
     * Used by {@link #mActivePointerId}.
     */
    private static final int INVALID_POINTER = -1;

    private boolean mFlingEnabled = true;
    private ScaleGestureDetector mScaleGestureDetector;
    double scaleBegin;
    double scaleX;
    double scaleDuration;

    private float maxWidth = 0;
    private float maxHeight = 0;
    private ChinaMapView chinaMapView ;
    private Component parent;

    public HVScaleScrollView(Context context) {
        this(context, null);
    }

    public HVScaleScrollView(Context context, AttrSet attrs) {
        super(context, attrs);
        initScrollView();
        initGesture(context);
    }

    private void initGesture(Context context) {
        mScaleGestureDetector = new ScaleGestureDetector(context, new ScaleGestureListener());
    }

    public void setChinaMapView(ChinaMapView chinaMapView) {
        parent = (Component) chinaMapView.getComponentParent();
        this.chinaMapView = chinaMapView;
    }
    public class ScaleGestureListener implements ScaleGestureDetector.OnScaleGestureListener {
        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            // TODO Auto-generated method stub
            //缩放比例
            double scale = detector.getScale() + scaleDuration;
//            Log.e(TAG, "onScale: " + scale);
            if (scale < 0.4f)
                scale = 0.4f;
            else if (scale > 2.0f)
                scale = 2.0f;

            parent.setScale((float) scale,(float) scale);
            chinaMapView.setScale((float) scale);
            chinaMapView.setOffset((parent.getWidth() * scale - parent.getWidth())/2, (parent.getHeight() * scale - parent.getHeight())/2);

            System.out.println("SCALE parent.getWidth() = " + maxWidth);
            maxWidth = chinaMapView.getWidth() * (float) scale;
            maxHeight = chinaMapView.getHeight() * (float) scale;
            return false;
        }

        @Override
        public boolean onScaleBegin(ScaleGestureDetector detector) {

            scaleX = getComponentAt(0).getScaleX();
            scaleBegin = mScaleGestureDetector.getScale();
            scaleDuration = scaleX - scaleBegin;
//            Log.e(TAG, "onScaleBegin: " + scaleDuration);
            return true;
        }

        @Override
        public void onScaleEnd(ScaleGestureDetector detector) {

        }

    }

    @Override
    public float getBoundaryFadeEffectRightRate() {
        if (getChildCount() == 0) {
            return 0.0f;
        }

        final int length = getFadeEffectBoundaryWidth();
        if (getScrollValue(AXIS_Y) < length) {
            return getScrollValue(AXIS_Y) / (float) length;
        }
        return 1.0f;
    }

    @Override
    public float getBoundaryFadeEffectLeftRate() {
        if (getChildCount() == 0) {
            return 0.0f;
        }

        final int length = getFadeEffectBoundaryWidth();
        if (getScrollValue(AXIS_X) < length) {
            return getScrollValue(AXIS_X) / (float) length;
        }

        return 1.0f;
    }


    @Override
    public float getBoundaryFadeEffectTopRate() {
        if (getChildCount() == 0) {
            return 0.0f;
        }

        final int length = getFadeEffectBoundaryWidth();
        final int rightEdge = getWidth() - getPaddingRight();
        final int span = getComponentAt(0).getRight() - getScrollValue(AXIS_Y) - rightEdge;
        if (span < length) {
            return span / (float) length;
        }

        return 1.0f;
    }

    @Override
    public float getBoundaryFadeEffectBottomRate() {
        if (getChildCount() == 0) {
            return 0.0f;
        }

        final int length = getFadeEffectBoundaryWidth();
        final int bottomEdge = getHeight() - getPaddingBottom();
        final int span = getComponentAt(0).getBottom() - getScrollValue(AXIS_Y) - bottomEdge;
        if (span < length) {
            return span / (float) length;
        }

        return 1.0f;
    }

    private void initScrollView() {
        mScroller = new ScrollHelper();
        setFocusable(FOCUS_ENABLE);
        setFocusOrder(FOCUS_CHILDREN_FIRST);
        this.setTouchEventListener(this::onTouchEvent);
        //setWillNotDraw(false);
       /* final ViewConfiguration configuration = ViewConfiguration.get(getContext());
        mTouchSlop = configuration.getScaledTouchSlop();
        mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
        mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();*/
    }

    @Override
    public void addComponent(Component childComponent) {
        if (getChildCount() > 0) {
            throw new IllegalStateException("ScrollView can host only one direct child");
        }
        super.addComponent(childComponent);
    }

    @Override
    public void addComponent(Component childComponent, int index) {
        if (getChildCount() > 0) {
            throw new IllegalStateException("ScrollView can host only one direct child");
        }
        super.addComponent(childComponent, index);
    }

    @Override
    public void addComponent(Component childComponent, ComponentContainer.LayoutConfig layoutConfig) {
        if (getChildCount() > 0) {
            throw new IllegalStateException("ScrollView can host only one direct child");
        }
        super.addComponent(childComponent, layoutConfig);
    }


    @Override
    public void addComponent(Component childComponent, int index, ComponentContainer.LayoutConfig layoutConfig) {
        if (getChildCount() > 0) {
            throw new IllegalStateException("ScrollView can host only one direct child");
        }
        super.addComponent(childComponent, index, layoutConfig);
    }

    /**
     * 设置view能否滚动
     *
     * @return view是否能够滚动
     */
    private boolean canScrollV() {
        Component child = getComponentAt(0);
        if (child != null) {
            int childHeight = child.getHeight();
            return getHeight() < childHeight + getPaddingTop() + getPaddingBottom();
        }
        return false;
    }

    private boolean canScrollH() {
        Component child = getComponentAt(0);
        if (child != null) {
            int childWidth = child.getWidth();
            return getWidth() < childWidth + getPaddingLeft() + getPaddingRight();
        }
        return false;
    }

    /**
     * Indicates whether this ScrollView's content is stretched to fill the viewport.
     *
     * @return True if the content fills the viewport, false otherwise.
     */
    public boolean isFillViewport() {
        return mFillViewport;
    }

    /**
     * Indicates this ScrollView whether it should stretch its content height to fill
     * the viewport or not.
     *
     * @param fillViewport True to stretch the content's height to the viewport's
     *                     boundaries, false otherwise.
     */
    public void setFillViewport(boolean fillViewport) {
        if (fillViewport != mFillViewport) {
            mFillViewport = fillViewport;
            //requestLayout();
        }
    }

    /**
     * Set whether arrow scrolling will animate its transition.
     *
     * @param smoothScrollingEnabled whether arrow scrolling will animate its transition
     */
    public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) {
        mSmoothScrollingEnabled = smoothScrollingEnabled;
    }

    @Override
    public boolean onEstimateSize(int widthMeasureSpec, int heightMeasureSpec) {
        if (!mFillViewport) {
            return true;
        }

        final int heightMode = EstimateSpec.getMode(heightMeasureSpec);
        final int widthMode = EstimateSpec.getMode(widthMeasureSpec);
        if (heightMode == EstimateSpec.UNCONSTRAINT && widthMode == EstimateSpec.UNCONSTRAINT) {
            return true;
        }

        if (getChildCount() > 0) {
            final Component child = getComponentAt(0);
            int height = getEstimatedHeight();
            int width = getEstimatedWidth();
            if (child.getEstimatedHeight() < height || child.getEstimatedWidth() < width) {
                width -= getPaddingLeft();
                width -= getPaddingRight();
                int childWidthMeasureSpec = EstimateSpec.getSizeWithMode(width, EstimateSpec.PRECISE);

                height -= getPaddingTop();
                height -= getPaddingBottom();
                int childHeightMeasureSpec = EstimateSpec.getSizeWithMode(height, EstimateSpec.PRECISE);

                child.estimateSize(childWidthMeasureSpec, childHeightMeasureSpec);
            }
        }
        return false;
    }
/*
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        if (!mFillViewport) {
            return;
        }

        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        if (heightMode == MeasureSpec.UNSPECIFIED && widthMode == MeasureSpec.UNSPECIFIED) {
            return;
        }

        if (getChildCount() > 0) {
            final View child = getChildAt(0);
            int height = getMeasuredHeight();
            int width = getMeasuredWidth();
            if (child.getMeasuredHeight() < height || child.getMeasuredWidth() < width) {
                width -= getPaddingLeft();
                width -= getPaddingRight();
                int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY);

                height -= getPaddingTop();
                height -= getPaddingBottom();
                int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

                child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
            }
        }
    }*/

    @Override
    public boolean onKeyEvent(Component component, KeyEvent keyEvent) {
        return false;
    }


    /**
     * 是否执行keyEvent事件
     *
     * @param event keyEvent事件
     * @return 是否执行keyEvent事件
     */
    public boolean executeKeyEvent(KeyBoardEvent event) {
        mTempRect.clear();

        boolean handled = false;
            int KeyCode = event.getKeyCode();
            switch (KeyCode) {
                case KeyEvent.KEY_DPAD_LEFT:
                    if (canScrollH()) {
                        if (!event.isNoncharacterKeyPressed(KeyCode)) {
                            handled = arrowScrollH(Component.DRAG_LEFT);
                        } else {
                            handled = fullScrollH(Component.DRAG_LEFT);
                        }
                    }
                    break;
                case KeyEvent.KEY_DPAD_RIGHT:
                    if (canScrollH()) {
                        if (!event.isNoncharacterKeyPressed(KeyCode)) {
                            handled = arrowScrollH(Component.DRAG_RIGHT);
                        } else {
                            handled = fullScrollH(Component.DRAG_RIGHT);
                        }
                    }
                    break;
                case KeyEvent.KEY_DPAD_UP:
                    if (canScrollV()) {
                        if (!event.isNoncharacterKeyPressed(KeyCode)) {
                            handled = arrowScrollV(Component.DRAG_UP);
                        } else {
                            handled = fullScrollV(Component.DRAG_UP);
                        }
                    }
                    break;
                case KeyEvent.KEY_DPAD_DOWN:
                    if (canScrollV()) {
                        if (!event.isNoncharacterKeyPressed(KeyCode)) {
                            handled = arrowScrollV(Component.DRAG_DOWN);
                        } else {
                            handled = fullScrollV(Component.DRAG_DOWN);
                        }
                    }
                    break;
            }
        return handled;
    }

    private boolean inChild(int x, int y) {
        if (getChildCount() > 0) {
            final int scrollX = getScrollValue(AXIS_X);
            final int scrollY = getScrollValue(AXIS_Y);
            final Component child = getComponentAt(0);
            return !(y < child.getTop() - scrollY
                    || y >= child.getBottom() - scrollY
                    || x < child.getLeft() - scrollX
                    || x >= child.getRight() - scrollX);
        }
        return false;
    }

    /*@Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {     
        *//*
         * This method JUST determines whether we want to intercept the motion. 
         * If we return true, onMotionEvent will be called and we do the actual 
         * scrolling there. 
         *//*
   
        *//*
         * Shortcut the most recurring case: the user is in the dragging 
         * state and he is moving his finger.  We want to intercept this 
         * motion. 
         *//*
        final int action = ev.getAction();
        if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) {
            return true;
        }

        switch (action & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_MOVE: {     
            *//*
             * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 
             * whether the user has moved far enough from his original down touch. 
             *//*
   
            *//*
             * Locally do absolute value. mLastMotionY is set to the y value 
             * of the down event. 
             *//*
                final int activePointerId = mActivePointerId;
                if (activePointerId == INVALID_POINTER) {
                    // If we don't have a valid id, the touch down wasn't on content.     
                    break;
                }

                final int pointerIndex = ev.findPointerIndex(activePointerId);
                final float y = ev.getY(pointerIndex);
                final int yDiff = (int) Math.abs(y - mLastMotionY);
                if (yDiff > mTouchSlop) {
                    mIsBeingDragged = true;
                    mLastMotionY = y;
                }
                final float x = ev.getX(pointerIndex);
                final int xDiff = (int) Math.abs(x - mLastMotionX);
                if (xDiff > mTouchSlop) {
                    mIsBeingDragged = true;
                    mLastMotionX = x;
                }
                break;
            }

            case MotionEvent.ACTION_DOWN: {
                final float x = ev.getX();
                final float y = ev.getY();
                if (!inChild((int) x, (int) y)) {
                    mIsBeingDragged = false;
                    break;
                }     
   
            *//*
             * Remember location of down touch. 
             * ACTION_DOWN always refers to pointer index 0. 
             *//*
                mLastMotionY = y;
                mLastMotionX = x;
                mActivePointerId = ev.getPointerId(0);     
   
            *//*
             * If being flinged and user touches the screen, initiate drag; 
             * otherwise don't.  mScroller.isFinished should be false when 
             * being flinged. 
             *//*
                mIsBeingDragged = !mScroller.isFinished();
                break;
            }

            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:     
            *//* Release the drag *//*
                mIsBeingDragged = false;
                mActivePointerId = INVALID_POINTER;
                break;
            case MotionEvent.ACTION_POINTER_UP:
                onSecondaryPointerUp(ev);
                break;
        }     
   
        *//*
         * The only time we want to intercept motion events is if we are in the 
         * drag mode. 
         *//*
        return mIsBeingDragged;
    }*/


    private float[] getRaw(TouchEvent touchEvent, Component component) {
        float[] touch = new float[2];
//        int[] location = component.getLocationOnScreen();
        touch[0] = touchEvent.getPointerScreenPosition(touchEvent.getIndex()).getX();// + location[0];
        touch[1] = touchEvent.getPointerScreenPosition(touchEvent.getIndex()).getY();// + location[1];
        return touch;
    }

    @Override
    public boolean onTouchEvent(Component component, TouchEvent touchEvent) {

        chinaMapView.onTouchEvent(component,touchEvent);

        if(chinaMapView.isOnlyClick()){
            return true;
        }

        if(maxWidth == 0 || maxHeight == 0){
            maxWidth = parent.getWidth();
            maxHeight = parent.getHeight();
        }

        mScaleGestureDetector.onTouchEvent(component, touchEvent);

        if (touchEvent.getAction() == TouchEvent.PRIMARY_POINT_DOWN) {
            // Don't handle edge touches immediately -- they may actually belong to one of our
            // descendants.
            //return false;
        }
        if (mVelocityTracker == null) {
            mVelocityTracker = VelocityDetector.obtainInstance();
        }
        mVelocityTracker.addEvent(touchEvent);

        final int action = touchEvent.getAction();

        switch (action) {
            case TouchEvent.PRIMARY_POINT_DOWN: {
                final float x = getRaw(touchEvent, component)[0];
                final float y = getRaw(touchEvent, component)[1];
//                if (!(mIsBeingDragged = inChild((int) x, (int) y))) {
//                    return false;
//                }

                /*
                 * If being flinged and user touches, stop the fling. isFinished
                 * will be false if being flinged.
                 */
                if (!mScroller.isFinished()) {
                    mScroller.abortAnimation();
                }

                // Remember where the motion event started
                mLastMotionY = y;
                mLastMotionX = x;
                System.out.println("TOUCH DOWN Y = " + mLastMotionY);
                mActivePointerId = touchEvent.getPointerId(0);
                break;
            }
            case TouchEvent.POINT_MOVE:
                if(touchEvent.getPointerCount() == 1 && !mScaleGestureDetector.isActive()){
                    final double x = getRaw(touchEvent, component)[0];
                    final double y = getRaw(touchEvent, component)[1];
                    System.out.println("TOUCH MOVE Y = " + y + " parentY = " + parent.getTranslationY());
                    System.out.println("TOUCH MOVE Y = " + y + " lastY = " + mLastMotionY);
                    double distanceX = (double) parent.getTranslationX() + x - mLastMotionX;
                    double distanceY = (float) ((double)parent.getTranslationY() + y - mLastMotionY);
                    distanceX = Math.max(-maxWidth/2, Math.min(distanceX, maxWidth/2));
                    distanceY = Math.max(-maxHeight/2, Math.min(distanceY, maxHeight/2));
                    chinaMapView.setTranslate(distanceX, distanceY);
                    parent.setTranslation((float) distanceX, (float) distanceY);
                    mLastMotionX = x;
                    mLastMotionY = y;
                }


                // parent.setTranslation(100,0);
//                if (mIsBeingDragged) {
//                    // Scroll to follow the motion event
//                    final int activePointerIndex = 0;//touchEvent.getPointerId(mActivePointerId);
//                    MmiPoint point = touchEvent.getPointerPosition(activePointerIndex);
//                    final float y = point.getY();
//                    final int deltaY = (int) (mLastMotionY - y);
//                    mLastMotionY = y;
//
//                    final float x = point.getX();
//                    final int deltaX = (int) (mLastMotionX - x);
//                    mLastMotionX = x;
//                    parent.setTranslation(parent.getTranslationX()+deltaX,deltaY);
//                    this.scrollBy(deltaX,deltaY);
//                   // scrollBy(deltaX, deltaY);
//                }
//                Log.i(TAG, "onTouchEvent: ACTION_MOVE");
//                if (mode == ZOOM) {
//                    // 两个手指滑动
//                    float newDist = distance(ev);
//                    if (newDist > 10f) {
//                        matrix.set(savedMatrix);
//                        float scale = newDist / oriDis;
//                        Log.e("mj", "onTouchEvent: " + scale);
//                        matrix.postScale(scale, scale, midPoint.x, midPoint.y);
//                        getChildAt(0).setScaleX(scale);
//                        getChildAt(0).setScaleY(scale);
//                    }
//                }
                break;
            case TouchEvent.PRIMARY_POINT_UP:
                mScaleGestureDetector.setActive(false);
                if (mIsBeingDragged) {
                    if (mFlingEnabled) {
                        final VelocityDetector velocityTracker = mVelocityTracker;
                        velocityTracker.calculateCurrentVelocity(0,1000, mMaximumVelocity);
                        int initialVelocitx = (int) velocityTracker.getHorizontalVelocity();
                        int initialVelocity = (int) velocityTracker.getVerticalVelocity();
                        if (getChildCount() > 0) {
                            if (Math.abs(initialVelocitx) > initialVelocitx || Math.abs(initialVelocity) > mMinimumVelocity) {
                                fling(-initialVelocitx, -initialVelocity);
                            }

                        }
                    }

                    mActivePointerId = INVALID_POINTER;
                    mIsBeingDragged = false;

                    if (mVelocityTracker != null) {
                        mVelocityTracker = null;
                    }
                }
                break;
            case TouchEvent.CANCEL:
                if (mIsBeingDragged && getChildCount() > 0) {
                    mActivePointerId = INVALID_POINTER;
                    mIsBeingDragged = false;
                    if (mVelocityTracker != null) {
                        mVelocityTracker = null;
                    }
                }
                break;
            case TouchEvent.OTHER_POINT_UP:
                onSecondaryPointerUp(touchEvent);
//                Log.i(TAG, "onTouchEvent: ACTION_POINTER_UP");
                break;

            // 双指
            case TouchEvent.OTHER_POINT_DOWN:
//                Log.i(TAG, "onTouchEvent: ACTION_POINTER_DOWN");
//                oriDis = distance(ev);
//                if (oriDis > 10f) {
//                    savedMatrix.set(matrix);
//                    midPoint = middle(ev);
//                    mode = ZOOM;
//                }
                break;
        }
        return true;
    }

    private static final String TAG = "HVScrollView";
    // 不同状态的表示：
    private static final int NONE = 0;
    private static final int DRAG = 1;
    private static final int ZOOM = 2;

    private void onSecondaryPointerUp(TouchEvent ev) {
        /*final int pointerIndex = (ev.getAction()) >>
                TouchEvent.ACTION_POINTER_ID_SHIFT;*/
        final int pointerId = ev.getPointerId(ev.getIndex());
        if (pointerId == mActivePointerId) {
            // This was our active pointer going up. Choose a new     
            // active pointer and adjust accordingly.     
            final int newPointerIndex = ev.getIndex() == 0 ? 1 : 0;
            MmiPoint point = ev.getPointerPosition(newPointerIndex);
            mLastMotionX = point.getX();
            mLastMotionY = point.getY();
            mActivePointerId = ev.getPointerId(newPointerIndex);
            if (mVelocityTracker != null) {
                mVelocityTracker.clear();
            }
        }
    }

    /**
     * <p>
     * Finds the next focusable component that fits in the specified bounds.
     * </p>
     *
     * @param topFocus look for a candidate is the one at the top of the bounds
     *                 if topFocus is true, or at the bottom of the bounds if topFocus is
     *                 false
     * @param top      the top offset of the bounds in which a focusable must be
     *                 found
     * @param bottom   the bottom offset of the bounds in which a focusable must
     *                 be found
     * @return the next focusable component in the bounds or null if none can
     * be found
     */
    private Component findFocusableViewInBoundsV(boolean topFocus, int top, int bottom) {

        List<Component> focusables = new ArrayList<>();
        DimensFloat componentSize = getComponentSize();
        int sizeXToInt = componentSize.getSizeXToInt();
        if (sizeXToInt <= 0) {
            return null;
        }
        for (int index = 0; index < sizeXToInt; index ++) {
            focusables.add(getComponentAt(index));
        }
        Component focusCandidate = null;
   
        /* 
         * A fully contained focusable is one where its top is below the bound's 
         * top, and its bottom is above the bound's bottom. A partially 
         * contained focusable is one where some part of it is within the 
         * bounds, but it also has some part that is not within bounds.  A fully contained 
         * focusable is preferred to a partially contained focusable. 
         */
        boolean foundFullyContainedFocusable = false;

        int count = focusables.size();
        for (int i = 0; i < count; i++) {
            Component view = focusables.get(i);
            int viewTop = view.getTop();
            int viewBottom = view.getBottom();

            if (top < viewBottom && viewTop < bottom) {     
                /* 
                 * the focusable is in the target area, it is a candidate for 
                 * focusing 
                 */

                final boolean viewIsFullyContained = (top < viewTop) &&
                        (viewBottom < bottom);

                if (focusCandidate == null) {     
                    /* No candidate, take this one */
                    focusCandidate = view;
                    foundFullyContainedFocusable = viewIsFullyContained;
                } else {
                    final boolean viewIsCloserToBoundary =
                            (topFocus && viewTop < focusCandidate.getTop()) ||
                                    (!topFocus && viewBottom > focusCandidate
                                            .getBottom());

                    if (foundFullyContainedFocusable) {
                        if (viewIsFullyContained && viewIsCloserToBoundary) {     
                            /* 
                             * We're dealing with only fully contained views, so 
                             * it has to be closer to the boundary to beat our 
                             * candidate 
                             */
                            focusCandidate = view;
                        }
                    } else {
                        if (viewIsFullyContained) {     
                            /* Any fully contained view beats a partially contained view */
                            focusCandidate = view;
                            foundFullyContainedFocusable = true;
                        } else if (viewIsCloserToBoundary) {     
                            /* 
                             * Partially contained view beats another partially 
                             * contained view if it's closer 
                             */
                            focusCandidate = view;
                        }
                    }
                }
            }
        }

        return focusCandidate;
    }

    private Component findFocusableViewInBoundsH(boolean leftFocus, int left, int right) {

        List<Component> focusables = new ArrayList<>();
        DimensFloat componentMinSize = getComponentMinSize();
        int sizeXToInt = componentMinSize.getSizeXToInt();
        if (sizeXToInt <= 0) {
            return null;
        }
        for (int index = 0; index < sizeXToInt; index ++) {
            focusables.add(this.getComponentAt(index));
        }
        Component focusCandidate = null;
   
        /* 
         * A fully contained focusable is one where its left is below the bound's 
         * left, and its right is above the bound's right. A partially 
         * contained focusable is one where some part of it is within the 
         * bounds, but it also has some part that is not within bounds.  A fully contained 
         * focusable is preferred to a partially contained focusable. 
         */
        boolean foundFullyContainedFocusable = false;

        int count = focusables.size();
        for (int i = 0; i < count; i++) {
            Component view = focusables.get(i);
            int viewLeft = view.getLeft();
            int viewRight = view.getRight();

            if (left < viewRight && viewLeft < right) {     
                /* 
                 * the focusable is in the target area, it is a candidate for 
                 * focusing 
                 */

                final boolean viewIsFullyContained = (left < viewLeft) &&
                        (viewRight < right);

                if (focusCandidate == null) {     
                    /* No candidate, take this one */
                    focusCandidate = view;
                    foundFullyContainedFocusable = viewIsFullyContained;
                } else {
                    final boolean viewIsCloserToBoundary =
                            (leftFocus && viewLeft < focusCandidate.getLeft()) ||
                                    (!leftFocus && viewRight > focusCandidate.getRight());

                    if (foundFullyContainedFocusable) {
                        if (viewIsFullyContained && viewIsCloserToBoundary) {     
                            /* 
                             * We're dealing with only fully contained views, so 
                             * it has to be closer to the boundary to beat our 
                             * candidate 
                             */
                            focusCandidate = view;
                        }
                    } else {
                        if (viewIsFullyContained) {     
                            /* Any fully contained view beats a partially contained view */
                            focusCandidate = view;
                            foundFullyContainedFocusable = true;
                        } else if (viewIsCloserToBoundary) {     
                            /* 
                             * Partially contained view beats another partially 
                             * contained view if it's closer 
                             */
                            focusCandidate = view;
                        }
                    }
                }
            }
        }

        return focusCandidate;
    }

    /**
     * <p>Handles scrolling in response to a "home/end" shortcut press. This
     * method will scroll the view to the top or bottom and give the focus
     * to the topmost/bottommost component in the new visible area. If no
     * component is a good candidate for focus, this scrollview reclaims the
     * focus.</p>
     *
     *                  to go the top of the view or
     *
     * @param direction
     * @return true if the key event is consumed by this method, false otherwise
     */
    public boolean fullScrollV(int direction) {
        boolean down = direction == Component.DRAG_DOWN;
        int height = getHeight();

        mTempRect.top = 0;
        mTempRect.bottom = height;

        if (down) {
            int count = getChildCount();
            if (count > 0) {
                Component view = getComponentAt(count - 1);
                mTempRect.bottom = view.getBottom();
                mTempRect.top = mTempRect.bottom - height;
            }
        }

        return scrollAndFocusV(direction, mTempRect.top, mTempRect.bottom);
    }

    public boolean fullScrollH(int direction) {
        boolean right = direction == Component.DRAG_RIGHT;
        int width = getWidth();

        mTempRect.left = 0;
        mTempRect.right = width;

        if (right) {
            int count = getChildCount();
            if (count > 0) {
                Component view = getComponentAt(0);
                mTempRect.right = view.getRight();
                mTempRect.left = mTempRect.right - width;
            }
        }

        return scrollAndFocusH(direction, mTempRect.left, mTempRect.right);
    }

    /**
     * <p>Scrolls the view to make the area defined by <code>top</code> and
     * <code>bottom</code> visible. This method attempts to give the focus
     * to a component visible in this area. If no component can be focused in
     * the new visible area, the focus is reclaimed by this scrollview.</p>
     *
     *                  to go upward
     * @param top       the top offset of the new area to be made visible
     * @param bottom    the bottom offset of the new area to be made visible
     * @param direction direction
     * @return true if the key event is consumed by this method, false otherwise
     */
    private boolean scrollAndFocusV(int direction, int top, int bottom) {
        boolean handled = true;

        int height = getHeight();
        int containerTop = getScrollValue(AXIS_Y);
        int containerBottom = containerTop + height;
        boolean up = direction == Component.DRAG_UP;

        Component newFocused = findFocusableViewInBoundsV(up, top, bottom);
        if (newFocused == null) {
            newFocused = this;
        }

        if (top >= containerTop && bottom <= containerBottom) {
            handled = false;
        } else {
            int delta = up ? (top - containerTop) : (bottom - containerBottom);
            doScrollY(delta);
        }

        if (newFocused != findFocus() && newFocused.requestFocus()) {
        }

        return handled;
    }

    private boolean scrollAndFocusH(int direction, int left, int right) {
        boolean handled = true;

        int width = getWidth();
        int containerLeft = getScrollValue(AXIS_X);
        int containerRight = containerLeft + width;
        boolean goLeft = direction == Component.DRAG_LEFT;

        if (left >= containerLeft && right <= containerRight) {
            handled = false;
        } else {
            int delta = goLeft ? (left - containerLeft) : (right - containerRight);
            doScrollX(delta);
        }

        return handled;
    }

    /**
     * Handle scrolling in response to an up or down arrow click.
     *
     * @param direction The direction corresponding to the arrow key that was
     *                  pressed
     * @return True if we consumed the event, false otherwise
     */
    public boolean arrowScrollV(int direction) {

        /*Component currentFocused = findFocus();
        if (currentFocused == this) currentFocused = null;

        Component nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction);

        final int maxJump = getMaxScrollAmountV();

        if (nextFocused != null && isWithinDeltaOfScreenV(nextFocused, maxJump, getHeight())) {
            nextFocused.getDrawingRect(mTempRect);
            offsetDescendantRectToMyCoords(nextFocused, mTempRect);
            int scrollDelta = computeScrollDeltaToGetChildRectOnScreenV(mTempRect);
            doScrollY(scrollDelta);
            nextFocused.requestFocus(direction);
        } else {
            // no new focus     
            int scrollDelta = maxJump;

            if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) {
                scrollDelta = getScrollY();
            } else if (direction == View.FOCUS_DOWN) {
                if (getChildCount() > 0) {
                    int daBottom = getChildAt(0).getBottom();

                    int screenBottom = getScrollY() + getHeight();

                    if (daBottom - screenBottom < maxJump) {
                        scrollDelta = daBottom - screenBottom;
                    }
                }
            }
            if (scrollDelta == 0) {
                return false;
            }
            doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta);
        }

        if (currentFocused != null && currentFocused.isFocused()
                && isOffScreenV(currentFocused)) {
            // previously focused item still has focus and is off screen, give     
            // it up (take it back to ourselves)     
            // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are     
            // sure to     
            // get it)     
            final int descendantFocusability = getDescendantFocusability();  // save     
            setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
            requestFocus();
            setDescendantFocusability(descendantFocusability);  // restore     
        }
        return true;*/
        return false;
    }

    public boolean arrowScrollH(int direction) {

        /*Component currentFocused = findFocus();
        if (currentFocused == this) currentFocused = null;

        View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction);

        final int maxJump = getMaxScrollAmountH();

        if (nextFocused != null && isWithinDeltaOfScreenH(nextFocused, maxJump)) {
            nextFocused.getDrawingRect(mTempRect);
            offsetDescendantRectToMyCoords(nextFocused, mTempRect);
            int scrollDelta = computeScrollDeltaToGetChildRectOnScreenH(mTempRect);
            doScrollX(scrollDelta);
            nextFocused.requestFocus(direction);
        } else {
            // no new focus     
            int scrollDelta = maxJump;

            if (direction == View.FOCUS_LEFT && getScrollX() < scrollDelta) {
                scrollDelta = getScrollX();
            } else if (direction == View.FOCUS_RIGHT && getChildCount() > 0) {

                int daRight = getChildAt(0).getRight();

                int screenRight = getScrollX() + getWidth();

                if (daRight - screenRight < maxJump) {
                    scrollDelta = daRight - screenRight;
                }
            }
            if (scrollDelta == 0) {
                return false;
            }
            doScrollX(direction == View.FOCUS_RIGHT ? scrollDelta : -scrollDelta);
        }

        if (currentFocused != null && currentFocused.isFocused()
                && isOffScreenH(currentFocused)) {
            // previously focused item still has focus and is off screen, give     
            // it up (take it back to ourselves)     
            // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are     
            // sure to     
            // get it)     
            final int descendantFocusability = getDescendantFocusability();  // save     
            setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
            requestFocus();
            setDescendantFocusability(descendantFocusability);  // restore     
        }
        return true;*/
        return false;
    }

    /**
     * Smooth scroll by a Y delta
     *
     * @param delta the number of pixels to scroll by on the Y axis
     */
    private void doScrollY(int delta) {
        if (delta != 0) {
            if (mSmoothScrollingEnabled) {
                smoothScrollBy(0, delta);
            } else {
                scrollBy(0, delta);
            }
        }
    }

    private void doScrollX(int delta) {
        if (delta != 0) {
            if (mSmoothScrollingEnabled) {
                smoothScrollBy(delta, 0);
            } else {
                parent.setTranslation(delta,0);
            }
        }
    }

    /**
     * smoothScrollBy
     *
     * @param dx the number of pixels to scroll by on the X axis
     * @param dy the number of pixels to scroll by on the Y axis
     */
    public void smoothScrollBy(int dx, int dy) {
        if (getChildCount() == 0) {
            // Nothing to do.     
            return;
        }
        long duration = /*AnimationUtils.currentAnimationTimeMillis()*/ - mLastScroll;
        if (duration > ANIMATED_SCROLL_GAP) {
            final int height = getHeight() - getPaddingBottom() - getPaddingTop();
            final int bottom = getComponentAt(0).getHeight();
            final int maxY = Math.max(0, bottom - height);
            final int scrollY = getScrollValue(AXIS_Y);
            dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY;

            final int width = getWidth() - getPaddingRight() - getPaddingLeft();
            final int right = getComponentAt(0).getWidth();
            final int maxX = Math.max(0, right - width);
            final int scrollX = getScrollValue(AXIS_X);
            dx = Math.max(0, Math.min(scrollX + dx, maxX)) - scrollX;

            mScroller.startScroll(scrollX, scrollY, dx, dy);
            invalidate();
        } else {
            if (!mScroller.isFinished()) {
                mScroller.abortAnimation();
            }
//            scrollBy(dx, dy);
            parent.setTranslation(dx,dy);
        }
        //mLastScroll = AnimationUtils.currentAnimationTimeMillis();
    }

    /**
     * Like {@link #scrollTo}, but scroll smoothly instead of immediately.
     *
     * @param x the position where to scroll on the X axis
     * @param y the position where to scroll on the Y axis
     */
    public final void smoothScrollTo(int x, int y) {
        smoothScrollBy(x - getScrollValue(AXIS_X), y - getScrollValue(AXIS_Y));
    }

    /**
     * <p>The scroll range of a scroll view is the overall height of all of its
     * children.</p>
     */
    /*@Override
    protected int computeVerticalScrollRange() {
        final int count = getChildCount();
        final int contentHeight = getHeight() - getPaddingBottom() - getPaddingTop();
        if (count == 0) {
            return contentHeight;
        }

        return getChildAt(0).getBottom();
    }

    @Override
    protected int computeHorizontalScrollRange() {
        final int count = getChildCount();
        final int contentWidth = getWidth() - getPaddingLeft() - getPaddingRight();
        if (count == 0) {
            return contentWidth;
        }

        return getChildAt(0).getRight();
    }

    @Override
    protected int computeVerticalScrollOffset() {
        return Math.max(0, super.computeVerticalScrollOffset());
    }

    @Override
    protected int computeHorizontalScrollOffset() {
        return Math.max(0, super.computeHorizontalScrollOffset());
    }

    @Override
    protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) {
        int childWidthMeasureSpec;
        int childHeightMeasureSpec;

        childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);

        childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);

        child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
    }

    @Override
    protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed,
                                           int parentHeightMeasureSpec, int heightUsed) {
        final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();

        final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
                lp.leftMargin + lp.rightMargin, MeasureSpec.UNSPECIFIED);
        final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
                lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED);

        child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
    }

    @Override
    public void computeScroll() {
        if (mScroller.computeScrollOffset()) {
            // This is called at drawing time by ViewGroup.  We don't want to     
            // re-show the scrollbars at this point, which scrollTo will do,     
            // so we replicate most of scrollTo here.     
            //     
            //         It's a little odd to call onScrollChanged from inside the drawing.     
            //     
            //         It is, except when you remember that computeScroll() is used to     
            //         animate scrolling. So unless we want to defer the onScrollChanged()     
            //         until the end of the animated scrolling, we don't really have a     
            //         choice here.     
            //     
            //         I agree.  The alternative, which I think would be worse, is to post     
            //         something and tell the subclasses later.  This is bad because there     
            //         will be a window where mScrollX/Y is different from what the app     
            //         thinks it is.     
            //     
            int x = mScroller.getCurrX();
            int y = mScroller.getCurrY();

            if (getChildCount() > 0) {
                View child = getChildAt(0);
                x = clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth());
                y = clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight());
                super.scrollTo(x, y);
            }
            awakenScrollBars();

            // Keep on drawing until the animation has finished.     
            postInvalidate();
        }
    }*/

    /**
     * Scrolls the view to the given child.
     *
     * @param child the View to scroll to
     */
    private void scrollToChild(Component child) {
        /*child.getDrawingRect(mTempRect);
   
        *//* Offset from child's local coordinates to ScrollView coordinates *//*
        offsetDescendantRectToMyCoords(child, mTempRect);

        int scrollDeltaV = computeScrollDeltaToGetChildRectOnScreenV(mTempRect);
        int scrollDeltaH = computeScrollDeltaToGetChildRectOnScreenH(mTempRect);

        if (scrollDeltaH != 0 || scrollDeltaV != 0) {
            scrollBy(scrollDeltaH, scrollDeltaV);
        }*/
    }

    /**
     * If rect is off screen, scroll just enough to get it (or at least the
     * first screen size chunk of it) on screen.
     *
     * @param rect      The rectangle.
     * @param immediate True to scroll immediately without animation
     * @return true if scrolling was performed
     */
    private boolean scrollToChildRect(Rect rect, boolean immediate) {
        final int deltaV = computeScrollDeltaToGetChildRectOnScreenV(rect);
        final int deltaH = computeScrollDeltaToGetChildRectOnScreenH(rect);
        final boolean scroll = deltaH != 0 || deltaV != 0;
        if (scroll) {
            if (immediate) {
                scrollBy(deltaH, deltaV);

            } else {
                smoothScrollBy(deltaH, deltaV);
            }


        }
        parent.setTranslation(deltaH,deltaV);
        return scroll;
    }

    /**
     * Compute the amount to scroll in the Y direction in order to get
     * a rectangle completely on the screen (or, if taller than the screen,
     * at least the first screen size chunk of it).
     *
     * @param rect The rect.
     * @return The scroll delta.
     */
    protected int computeScrollDeltaToGetChildRectOnScreenV(Rect rect) {
        if (getChildCount() == 0) return 0;

        int height = getHeight();
        int screenTop = getScrollValue(AXIS_Y);
        int screenBottom = screenTop + height;

        int fadingEdge = getFadeEffectBoundaryWidth();

        // leave room for top fading edge as long as rect isn't at very top     
        if (rect.top > 0) {
            screenTop += fadingEdge;
        }

        // leave room for bottom fading edge as long as rect isn't at very bottom     
        if (rect.bottom < getComponentAt(0).getHeight()) {
            screenBottom -= fadingEdge;
        }

        int scrollYDelta = 0;

        if (rect.bottom > screenBottom && rect.top > screenTop) {
            // need to move down to get it in view: move down just enough so     
            // that the entire rectangle is in view (or at least the first     
            // screen size chunk).     

            if (rect.getHeight() > height) {
                // just enough to get screen size chunk on     
                scrollYDelta += (rect.top - screenTop);
            } else {
                // get entire rect at bottom of screen     
                scrollYDelta += (rect.bottom - screenBottom);
            }

            // make sure we aren't scrolling beyond the end of our content     
            int bottom = getComponentAt(0).getBottom();
            int distanceToBottom = bottom - screenBottom;
            scrollYDelta = Math.min(scrollYDelta, distanceToBottom);

        } else if (rect.top < screenTop && rect.bottom < screenBottom) {
            // need to move up to get it in view: move up just enough so that     
            // entire rectangle is in view (or at least the first screen     
            // size chunk of it).     

            if (rect.getHeight() > height) {
                // screen size chunk     
                scrollYDelta -= (screenBottom - rect.bottom);
            } else {
                // entire rect at top     
                scrollYDelta -= (screenTop - rect.top);
            }

            // make sure we aren't scrolling any further than the top our content     
            scrollYDelta = Math.max(scrollYDelta, -getScrollValue(AXIS_Y));
        }
        return scrollYDelta;
    }

    protected int computeScrollDeltaToGetChildRectOnScreenH(Rect rect) {
        if (getChildCount() == 0) return 0;

        int width = getWidth();
        int screenLeft = getScrollValue(AXIS_X);
        int screenRight = screenLeft + width;

        int fadingEdge = getFadeEffectBoundaryWidth();

        // leave room for left fading edge as long as rect isn't at very left     
        if (rect.left > 0) {
            screenLeft += fadingEdge;
        }

        // leave room for right fading edge as long as rect isn't at very right     
        if (rect.right < getComponentAt(0).getWidth()) {
            screenRight -= fadingEdge;
        }

        int scrollXDelta = 0;

        if (rect.right > screenRight && rect.left > screenLeft) {
            // need to move right to get it in view: move right just enough so     
            // that the entire rectangle is in view (or at least the first     
            // screen size chunk).     

            if (rect.getWidth() > width) {
                // just enough to get screen size chunk on     
                scrollXDelta += (rect.left - screenLeft);
            } else {
                // get entire rect at right of screen     
                scrollXDelta += (rect.right - screenRight);
            }

            // make sure we aren't scrolling beyond the end of our content     
            int right = getComponentAt(0).getRight();
            int distanceToRight = right - screenRight;
            scrollXDelta = Math.min(scrollXDelta, distanceToRight);

        } else if (rect.left < screenLeft && rect.right < screenRight) {
            // need to move right to get it in view: move right just enough so that     
            // entire rectangle is in view (or at least the first screen     
            // size chunk of it).     

            if (rect.getWidth() > width) {
                // screen size chunk     
                scrollXDelta -= (screenRight - rect.right);
            } else {
                // entire rect at left     
                scrollXDelta -= (screenLeft - rect.left);
            }

            // make sure we aren't scrolling any further than the left our content     
            scrollXDelta = Math.max(scrollXDelta, -getScrollValue(AXIS_X));
        }
        return scrollXDelta;
    }


  /*  @Override
    public void requestChildFocus(View child, View focused) {
        if (!mScrollViewMovedFocus) {
            if (!mIsLayoutDirty) {
                scrollToChild(focused);
            } else {
                // The child may not be laid out yet, we can't compute the scroll yet     
                mChildToScrollTo = focused;
            }
        }
        super.requestChildFocus(child, focused);
    }*/


    /**
     * When looking for focus in children of a scroll view, need to be a little
     * more careful not to give focus to something that is scrolled off screen.
     * <p>
     * This is more expensive than the default {@link ViewGroup}
     * implementation, otherwise this behavior might have been made the default.
     */
/*    @Override
    protected boolean onRequestFocusInDescendants(int direction,
                                                  Rect previouslyFocusedRect) {

        // convert from forward / backward notation to up / down / left / right     
        // (ugh).     
        // TODO: FUCK     
        //        if (direction == View.FOCUS_FORWARD) {     
        //            direction = View.FOCUS_RIGHT;     
        //        } else if (direction == View.FOCUS_BACKWARD) {     
        //            direction = View.FOCUS_LEFT;     
        //        }     

        final View nextFocus = previouslyFocusedRect == null ?
                FocusFinder.getInstance().findNextFocus(this, null, direction) :
                FocusFinder.getInstance().findNextFocusFromRect(this,
                        previouslyFocusedRect, direction);

        if (nextFocus == null) {
            return false;
        }

        //        if (isOffScreenH(nextFocus)) {     
        //            return false;     
        //        }     

        return nextFocus.requestFocus(direction, previouslyFocusedRect);
    }*/

    /*@Override
    public boolean requestChildRectangleOnScreen(View child, Rect rectangle,
                                                 boolean immediate) {
        // offset into coordinate space of this scroll view     
        rectangle.offset(child.getLeft() - child.getScrollX(),
                child.getTop() - child.getScrollY());

        return scrollToChildRect(rectangle, immediate);
    }*/

    /*@Override
    public void requestLayout() {
        mIsLayoutDirty = true;
        super.requestLayout();
    }*/

  /*  @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        mIsLayoutDirty = false;
        // Give a child focus if it needs it      
        if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) {
            scrollToChild(mChildToScrollTo);
        }
        mChildToScrollTo = null;

        // Calling this with the present values causes it to re-clam them     
        scrollTo(getScrollX(), getScrollY());
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        View currentFocused = findFocus();
        if (null == currentFocused || this == currentFocused)
            return;

        // If the currently-focused view was visible on the screen when the     
        // screen was at the old height, then scroll the screen to make that     
        // view visible with the new screen height.     
        if (isWithinDeltaOfScreenV(currentFocused, 0, oldh)) {
            currentFocused.getDrawingRect(mTempRect);
            offsetDescendantRectToMyCoords(currentFocused, mTempRect);
            int scrollDelta = computeScrollDeltaToGetChildRectOnScreenV(mTempRect);
            doScrollY(scrollDelta);
        }

        final int maxJump = getRight() - getLeft();
        if (isWithinDeltaOfScreenH(currentFocused, maxJump)) {
            currentFocused.getDrawingRect(mTempRect);
            offsetDescendantRectToMyCoords(currentFocused, mTempRect);
            int scrollDelta = computeScrollDeltaToGetChildRectOnScreenH(mTempRect);
            doScrollX(scrollDelta);
        }
    }*/

    /**
     * Return true if child is an descendant of parent, (or equal to the parent).
     *
     * @param child child
     * @param parent parent
     * @return 是否Descendant
     */
    private boolean isViewDescendantOf(Component child, Component parent) {
        if (child == parent) {
            return true;
        }

        final ComponentParent theParent = child.getComponentParent();
        return (theParent instanceof ComponentContainer) && isViewDescendantOf((Component) theParent, parent);
    }

    /**
     * Fling the scroll view
     * @param velocityX velocityX
     * @param velocityY The initial velocity in the Y direction. Positive
     *                  numbers mean that the finger/cursor is moving down the screen,
     *                  which means we want to scroll towards the top.
     */
    public void fling(int velocityX, int velocityY) {
        if (getChildCount() > 0) {
            int width = getWidth() - getPaddingRight() - getPaddingLeft();
            int right = getComponentAt(0).getWidth();

            int height = getHeight() - getPaddingBottom() - getPaddingTop();
            int bottom = getComponentAt(0).getHeight();

            mScroller.doFling(getScrollValue(AXIS_X), getScrollValue(AXIS_Y), velocityX, velocityY,
                    0, Math.max(0, right - width),
                    0, Math.max(0, bottom - height));

            //            final boolean movingDown = velocityX > 0 || velocityY > 0;     
            //         
            //            View newFocused =     
            //                    findFocusableViewInMyBoundsV(movingDown, mScroller.getFinalY(), findFocus());     
            //            if (newFocused == null) {     
            //                newFocused = this;     
            //            }     
            //         
            //            if (newFocused != findFocus()     
            //                    && newFocused.requestFocus(movingDown ? View.FOCUS_DOWN : View.FOCUS_UP)) {     
            //                mScrollViewMovedFocus = true;     
            //                mScrollViewMovedFocus = false;     
            //            }     

            invalidate();
        }
    }


    /**
     * 滚动到指定位置
     *
     * @param x x轴滚动距离
     * @param y y轴滚动距离
     */
    @Override
    public void scrollTo(int x, int y) {
        // we rely on the fact the View.scrollBy calls scrollTo.     
        if (getChildCount() > 0) {
            Component child = getComponentAt(0);
            x = clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth());
            y = clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight());
            if (x != getScrollValue(AXIS_X) || y != getScrollValue(AXIS_Y)) {
                parent.setTranslation(x,y);
            }
        }
    }

    private int clamp(int n, int my, int child) {
        if (my >= child || n < 0) {     
            /* my >= child is this case: 
             *                    |--------------- me ---------------| 
             *     |------ child ------| 
             * or 
             *     |--------------- me ---------------| 
             *            |------ child ------| 
             * or 
             *     |--------------- me ---------------| 
             *                                  |------ child ------| 
             * 
             * n < 0 is this case: 
             *     |------ me ------| 
             *                    |-------- child --------| 
             *     |-- mScrollX --| 
             */
            return 0;
        }
        if ((my + n) > child) {     
            /* this case: 
             *                    |------ me ------| 
             *     |------ child ------| 
             *     |-- mScrollX --| 
             */
            return child - my;
        }
        return n;
    }

    public boolean isFlingEnabled() {
        return mFlingEnabled;
    }

    public void setFlingEnabled(boolean flingEnabled) {
        this.mFlingEnabled = flingEnabled;
    }
}    